Process for stretching filaments



.une 24, 969 D- GEERDES ETAL 3,452,13

- PROCESS FOR STRETCHING FILAMENTS Shee Filed june 27] 1967 4. A processincluding the coupled steps of Spinning lamentary yarn from a nylon meltat Spinning Speeds in excess of S00 yards/1T1inute, quenching the Spunyarn and draWing the quenched yarll t0 pfoduce an orientationcoreSp0nding to a total draw rati0 0f at leaSt 0ne and a half and lessthan four between Hrst stage feed and draw rolls and further drawing theyarn in a Separate bllt coupled second Stage, the improvement of Whichcomprises substantially 10calizing the iifst-Stage draw p0int in Spacedrelationship t0 the iirst-Stage feed and draw rolls by passing said yarnthrough an enc10sure and, in said enc10sure, jetting a heated gaseousnuid thereon, ffom one Side thereof the timeteInperature-pressureTelationship of exposure t0 Said jetting iuid being such as to raise theyam to a temperature Which is at least 50% of T and to reduce thedrawing tension t0 no n0re than about 80% Of the ten- Sion on the yam inthe absence of Said uid, said yam 1/19Z oberly 13415 2/1967 1 itzl 26078FOREIGN PATENTS 78,38 10/196 Great Britain.

